A dc/dc conversion and control system for proton exchange membrane fuel cell backup power system

Abstract

The invention relates to a DC / DC conversion and control system used for a standby power system of a proton exchange membrane fuel cell. The DC / DC conversion and control system comprises a main circuit loop and a control loop. The main circuit loop comprises a gas supply unit, a gas loop control electromagnet valve, the proton exchange membrane fuel cell, a DC / DC conversion circuit of a DC / DC converter and a standby storage battery. The control loop comprises a collection PLC, a communication module of the DC / DC converter and a MCU circuit. The communication module is used for realizing communication between the collection PLC and the MCU circuit, and the MCU circuit is connected with a load circuit and the DC / DC converter and is used for collecting output voltages and output currents of the DC / DC converter, sending the output voltages and the output currents of the DC / DC converter to the collection PLC, receiving processing information of the collection PLC and adjusting a PWM chip of the DC / DC converter according to the processing information.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cell application technology, and in particular relates to the design of a proton exchange membrane fuel cell communication backup power system, in particular to the design and control of a DC / DC converter in the proton exchange membrane fuel cell communication backup power system. Background technique [0002] Proton exchange membrane fuel cell (hereinafter referred to as FC) has the attractive characteristics of high efficiency, no pollution, short construction period, easy maintenance and low cost. It is not only the most promising alternative clean energy for automobiles, but also widely used in space shuttles , submarines, underwater robots, communication systems, small and medium-sized power stations, and household power supplies are very suitable for providing mobile, decentralized power supplies and power supply close to end users, and can also solve the problem of power grid pea...

AI Technical Summary

Problems solved by technology

[0005] Humidity is a very important condition when FC works. Only when a certain humidity is maintained on the proton exchange membrane (MEA for short), hydrogen and oxygen can transmit electrical energy through the electrochemical reaction of the MEA. If the humidity in the air is low, the MEA will If the MEA is dry, the power transmission of the MEA will be affected, so that the MEA cannot reach the optimal working state, that is, it cannot achieve the optimal working state. The MEA can only generate moisture when it is working under load, that is, it can increase the humidity by itself. The output power cannot reach the optimum point when the optimum humidity is not reached

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